Pin cherry in bloom

I’m trying to identify more plants growing in my area. Starting with this tree, which I love to see in bloom. I realized we have a little nursery of young ones (also blooming) inside our garden fence behind the shed.

The guide “Forest Trees of Maine” says about this tree:

…not used commercially and has little value except as a protection and cover for the soil on recent clearings or burned areas.

It’s also known as fire cherry and bird cherry.
Pin cherry in bloom between the garden and the forest
Young pin cherries in a grove behind the garden shed
Pin cherry blooms